Greenish-blue dye and process of making same.



UNITED ETATES PATENT heron.

HERMAN LORETAN, OF BASEL, SWITZERLAND, ASSIGNOR TO THE FIRM OF DYE WORKS FORMERLY L. DURAND, HUGUENIN & CO, OF BASEL,

' sodimethylanilin and gallamid are heated at SWITZERLAND.

Application filed October 19.1906.

To all whom it may concern;

Be it known that I, HERMAN LeRnTAN,

l chemist, a citizen of the Swiss Republic, and a resident of Basel, Switzerland, have invented 5 new Greenish-Blue Dyestuffs and a Process 1' for the Manufacture of the Same, of which the following is a full, clear, and exact specification.

I have found that the gallocyanins obtained by the action of nitresedialkylanilins en gallic acid and its derivatives may be condcnsed with aromatic diamins which have at least one amide group free, and thus yield l new dyestuffs interesting owing to their fastness to fulling and to chlorin. This condensation may be facilitated by the presence of easily-reducible substances, such as nitrobenzene or nitronaphthalenes, which. have the effect of preventing the simultaneous formation of leucegallocyanins. The condensatien products thus obtained are green crystalline products appearing bronze by reflected light. They are little soluble in wal ter and alcohol, soluble in acetic acid to a blue solution, and in concentrated sulfuric acid to a red solution. This solution be- 1 comes yellow-brown on addition of water. The condensation of the gallecyanins with the diamins may be carried out in the absence or presence of appropriate solvents.

Example I: For three hours thirty-four kilos of the gallocyanin obtained from nitro- 70 centigrade with one hundred kilos of dimethylor diethyl-paraphenylenediamin and ten kilos of dinitrebenzene. Three hundred kilos of alcohol are then added while stirring. The whole is allowed to cool completely, and he solid matter is filtered, pressed, and dried. The condensation product is a greenish crystalline powder.

Example II: Amixture of thirty-four kilos of the gallocyanin obtained from nitresodimethylanilin and methylgallate, fifty kilos of dimethyler diethyl-paraphenylenediamin, fifty kilos of alcohol, and ten kilos of dinitre benzene is boiled for six hours in a reflux apparatus Two hundred kilos of alcohol are added, the whole allowed to cool, and the solid matter is filtered, pressed, and dried. The condensation product resembles in appearance that obtained according to Example I.

Specification of Letters Patent.

Patented Feb. 12, 1907.

Serial No. 339.674. (Specimens) Example III: A mixture of thirty-four kilos of the gallocyanin obtained from nitrosediethylanilin and gall amid, one hundred liters of water, and fifty kilos of dimethylor diethyl-paraplienylenediamin is heated for eight hours at 100 centigrade in an open vessel and with thorough stirring. Five hun dred liters of cold water are then added and in small doses 2530 kilos of hydrochloric acid of 20 Baum specific gravity. The whole is allowed to cool completely and the solid matter filtered, pressed, and dried.

Example IV A mixture of thirty-four kilos of the gallecyanin from nitresodiethylanilin and gallamid, fifty kilos of meta-phenylenediamin, and sixty kilos of alcohol is boiled in a reflux apparatus for six hours. The mass is poured into one thousand liters of water mixed with one hundred kilos of hydrochloric acid of 20 O Baum specific gravity. '.he dyestufl is precipitated by addition of common salt,.filtered, pressed, and dried.

The pro duct of condensation is a greenishblack powder.

What I claim is 1. The described process for the manufacture of green-blue dyestuffs by condensing a gallecyanin with an aromatic diamin having at least one free amide group.

2. The described process for the manufacture of green-blue dyestuii's by condensing a gallecyanin with an aromatic diamin having at least one free amide group, in presence of a nitro be dy.

3. As new products, the described greenblue (:lyestufls fast to fulling and to chlorin, derived from a gallecyanin and an aromatic diamin and constituting in dry state green crystalline powders appearing bronze by reilected light, little soluble in water and alcohol, soluble in acetic acid to a blue solution and in concentrated sulfuric acid to a red selution becoming yellow-brown on addition of water.

In witness whereof I have hereunto signed my name, tlzis 3d day of October, 1906, in the presence of two subscribing witnesses.

HERMAN LORETAN. 

